The influence of constant illumination and six photoperiodic modes of different duration on production of blue-green alga Spirulina (Arthrospira) platensis was investigated. It was shown established, that dark the periods during alga cultivation were essential for effective biosynthesis of biomass, proteins, carotenoids, phycocyanin and chlorophyll. The highest rates of biomass, proteins and pigments biosynthesis were observed for 14 days at 10 h light to 14 h dark cycle and 12 h light to 12 h dark cycle. Under such conditions Spirulina synthesised almost twice as much biomass, proteins and pigments per kW·h, than under constant illumination.
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